Cisco Catalyst 3750-E Software Configuration Manual page 949

Chapter 38 Configuring EtherChannels and Link-State Tracking
You can create an EtherChannel on a standalone switch, on a single switch in the stack, or on multiple
switches in the stack (known as cross-stack EtherChannel). See
If a link within an EtherChannel fails, traffic previously carried over that failed link moves to the
remaining links within the EtherChannel. If traps are enabled on the switch, a trap is sent for a failure
that identifies the switch, the EtherChannel, and the failed link. Inbound broadcast and multicast packets
on one link in an EtherChannel are blocked from returning on any other link of the EtherChannel.
Figure 38-2
StackWise Plus
connections
OL-9775-08
Single-Switch EtherChannel
Switch stack
Switch 1
port
Switch 2
Switch 3
Figure 38-2
Channel
group 1
Channel
group 2
Catalyst 3750-E and 3560-E Switch Software Configuration Guide
Understanding EtherChannels
and Figure 38-3.
Switch A
38-3